Medical Definition of hydration
1: the act or process of combining or treating with water: asa: the introduction of additional fluid into the body hydration sometimes helps to reduce the concentration of toxic substances in the tissuesb: a chemical reaction in which water takes part with the formation of only one product hydration of ethylene to ethyl alcohol; especially : a reaction in which water takes part in the form of intact molecules
2: the quality or state of being hydrated; especially : the condition of having adequate fluid in the body tissues
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